Ray--adjusting the shaft in the 3-way will change it's throw a bit. Shorten the shaft, a bit tighter working. Lengthen it, longer pull but less chance of shortstroking, if it's still a full pull.
Wycke--I'm not sure, but I think a lot of 3-way shafts were more or less like the stock one. Check to see if one in a rebuild kit works?